Photovoltaics - IPHT Jena

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3 Basics of Photovoltaics - 12 - 1 Absorption of light: cell is not transparent Example Si wafer cell 2 Generation of charge carriers electrons & holes 3 Carriers are mobile: diffusion 6 4 5 Carrier life-time high enough Charge separation p-n junction hetero junction p-Si 3 4 1,2 + 3 4 6 Carrier leave cell Space charge region 5 contacts n-Si Fig. 3.1: Basic processes in a solar cell conduction band band gap E g valence band ? ? ? ? ? ? hνE g 3 Basics of Photovoltaics F. Falk, Photovoltaics WS 2010/11 ? ? ? ? ? ? fs fs loss µs loss Fig. 3.2: Photon absorption an carrier excitation in a semiconductor 6 electrons holes - contact + contact
Table 3.1: Band gaps of semiconductors - 13 - Fig. 3.3: Limits for solar cell efficiency as depending on the band gap. Upper left: Ultimate efficiency,upper right: Shockley-Queisser-limit, below: semiempirical efficiency [Hu] Semiconductor Si a-Si GaAs CdTe CuInSe2 Eg/eV 1,12 1,6...1,7 1,43 1,43 1,05 3 Basics of Photovoltaics F. Falk, Photovoltaics WS 2010/11
Page 1 and 2: Institute of Photonic Technology Al
Page 3 and 4: - 3 - 1 Energy Consumption and ist
Page 5 and 6: - 5 - Fig. 1.4: Increase of mean te
Page 7 and 8: - 7 - Table 1.4: Production and mar
Page 9 and 10: -9 - Fig. 2.3: Insolation as depend
Page 11: - 11 - Fig. 2.6: Average yearly glo
Page 15 and 16: - 15 - Fig. 3.6: Absorptions coeffi
Page 17 and 18: - 17 - 4 Semiconductors I: Equilibr
Page 19 and 20: Fig. 4.4: Band structure of GaAs Fi
Page 21 and 22: Fig. 4.9: Fermi distribution for di
Page 23 and 24: - 23 - Fig. 4.12: Carrier density i
Page 25 and 26: - 25 - Fig. 4.17: Resistivity of n-
Page 27 and 28: - 27 - Fig. 4.20: Band bending near
Page 29 and 30: - 29 - 4 Semiconductors I: Equilibr
Page 31 and 32: - 31 - 5 Semiconductors II: Non-Equ
Page 33 and 34: Reverse bias n-type + Forward bias
Page 35 and 36: - 35 - Fig. 5.7: Width of space cha
Page 37 and 38: Fig. 5.10: I-V-curve of a solar cel
Page 39 and 40: Fig. 5.12: Circuit diagram of a sol
Page 41 and 42: Fig. 6.3: Wire saw for wafering - 4
Page 43 and 44: - 43 - Fig. 6.6: Open circuit volta
Page 45 and 46: - 45 - Fig. 6.10: Open circuit vola
Page 47 and 48: - 48 - 7 Types of Solar Cells II: T
Page 49 and 50: - 50 - Fig. 7.5: Open circuit volta
Page 51 and 52: - 52 - 7 Types of Solar Cells II: T
Page 53 and 54: - 54 - Fig. 7.12: LLC process: Laye
Page 55 and 56: Table 7.1: Properties of CdTe and C
Page 57 and 58: Fig. 7.20: Phasen diagram of CdTe/C
Page 59 and 60: - 60 - Fig. 7.24: Band diagram of a
Page 61 and 62: enlargement X 1 X 10 3 X 10 6 X 10
Page 63 and 64:
References A. Goetzberger, V.U. Hof
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Photovoltaics - IPHT Jena

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